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A microscope has a 12.0 X eyepiece and a 59.0X objective lens 20.0cm apart. Calculate

(a) the total magnification, (b) the focal length of each lens, and (c) where the object must be, for a normal relaxed eye to see it in focus.

I have solved (a) easily through M = m_{o}M_{e}, for (b), I have managed to obtain the focal length of the eyepiece being 2.08 cm. But I am having difficulty finding the focal length of the objective lens. When I apply the formula m = D/f + 1 I don't get the answer provided.

Can anyone help me out?

Thanks

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# Finding focal lens of compound microscope

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